PDF XChange Viewer with OCR plugin - Recommended. At least as good as many commercial tools I've used. Note that you'll have to convert images over to PDF, which can also be done with some portable tools: FastStone can batch convert and PDFTK Builder will combine many PDFs into one document (Docx2rtf would also probably work).

IrfanView with OCR plugin - works pretty well, good for quickly pulling words from a screencap or other image.

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